Śatapatha Brāhmaṇa ("of a hundred paths") 3.3.1.1

3.3.1.1

sapta padānyanunikrāmati | vṛṅkta evaināmetattasmātsapta padānyanunikrāmati yatra vai vācaḥ prajātāni candāṃsi saptapadā vai teṣām parārdhyā śakvarī tāmevaitatparastādarvācīṃ vṛṅkte tasmātsapta padānyanunikrāmati

He follows her, stepping into seven foot-prints of hers; he thereby takes possession of her: that is why he steps into seven of her foot-prints. For when the metres were produced from Vâk (speech), the one consisting of seven feet, the Sakvarî, was the last (highest) of them. It is that (metre) he now draws down towards himself from above: this is why he steps into seven of her foot-prints.